Research depth
Discovery
How well the tool supports keyword, competitor, SERP, backlink, or market research before execution.
cognitiveSEO
Broad first-party SEO research coverage across links, rankings, keywords, competitors and site issues.
The homepage lists Site Explorer, Keyword Tool, competitor strategy research, backlink analysis, rank tracking and a comprehensive Site Audit: https://cognitiveseo.com/
KeywordsPeopleUse
Deep question, query, SERP, and audience-intent research for content planning, but not a broad backlink or technical research suite.
KeywordsPeopleUse mines People Also Ask, autocomplete, related searches, Reddit, Quora, and other question sources for content research. https://keywordspeopleuse.com/